General Science

Practice all of General Science

Questions from every topic, mixed together. The quickest way to see where you stand.

Or practice one topic

Best right after you read that topic’s lesson, to check it stuck. These are the 22 topics in General Science, in the order worth learning them.

• Scientific Method and MeasurementHypothesis, variables and controls, plus SI units and the conversions that get tested.
• Cell Structure and FunctionOrganelles and what each does, and the difference between plant and animal cells.
• Cell Division and GeneticsMitosis and meiosis, DNA, dominant and recessive traits, and simple inheritance.
• Human Body SystemsThe major systems, the organs in each, and what each system does.
• Nutrition and HealthMacronutrients and micronutrients, vitamins and the deficiency diseases, and what the body does with each.
• Plants and PhotosynthesisPlant structure, photosynthesis and respiration, and plant reproduction.
• Ecology and ClassificationFood chains and webs, biomes, symbiosis, and the taxonomic ranks.
• Evolution and Natural SelectionVariation, selection and adaptation, how species diverge, and the evidence for common descent.
• Animal Diversity and PhysiologyThe major animal phyla, body plans and symmetry, metamorphosis, and how non-human animals breathe, circulate and reproduce.
• Geology and Earth StructureEarth's layers, plate tectonics, the rock cycle, earthquakes and volcanoes.
• Weather and the AtmosphereAtmospheric layers, fronts, cloud types, and what drives severe weather.
• Oceans and the Water CycleEvaporation through precipitation, ocean currents, tides and salinity.
• Astronomy and the Solar SystemThe planets, the moon's phases, stars and their life cycle, and the scale of the universe.
• Atoms and the Periodic TableProtons, neutrons and electrons, atomic number and mass, and how the table is organized.
• States of Matter and Phase ChangesSolid, liquid and gas, the six phase changes, and density.
• Chemical Reactions, Acids and BasesReaction types, balancing, compounds and mixtures, and the pH scale.
• Motion and Newton's LawsSpeed, velocity and acceleration, the three laws, and mass against weight.
• Work, Energy and PowerKinetic and potential energy, conservation, and the units each is measured in.
• Heat and TemperatureConduction, convection and radiation, temperature scales, and specific heat.
• Waves, Sound and LightWave properties, the electromagnetic spectrum, reflection and refraction.
• Electricity BasicsCharge, current, voltage and resistance, conductors and insulators, and what the parts of a simple circuit do.
• Magnetism and ElectromagnetismMagnetic poles and fields, what a compass responds to, electromagnets, and how motors and generators convert between motion and electricity.